JP2012246610A - Sediment inflow prevention device for channel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sediment inflow prevention device for a channel which automatically closes a water intake when a water level rises to prevent sediment and stone from flowing into a channel while allowing water to be continuously taken.SOLUTION: A sediment inflow prevention device for a channel comprises: a plate-like gate 10 capable of closing a water intake 101 of a canal 100; a pair of right and left connection bars 41 which are rotatable and connect side faces of the gate 10 and upper portions of a canal; a pair of right and left props 21 which are rotatably connected to frontal side faces with lower edges thereof placed on upper surfaces 105 of the canal; and a collision plate 51 which is placed across lower portions of the pair of right and left props. The gate 10 has through-holes 11 which prevent sediment and stone from flowing into the canal 100 while allowing water to be taken. When a water level rises and water current pushes the collision plate 51, the gate 10 supported above the canal 100 with the props 21 as well as the connection bars 41 is fallen down to close the water intake 101.

Description

  TECHNICAL FIELD The present invention relates to an apparatus for preventing inflow of sediment from a channel, which can be installed and used at a water intake, while preventing sediment and stones from flowing into the water channel when water is increased due to flooding or the like.

  In facilities that take river water from rivers, such as irrigation canals, screens, etc. are installed at the irrigation canals (intakes) to prevent dust from flowing into the irrigation canals. Stones will flow in. By reducing the size of the screen installed at the mouth (water intake), it is possible to prevent the inflow of stones even during floods. However, if the screen is blocked by fallen leaves, The screen size cannot be made extremely small. The work of transporting sediment that has flowed into and out of the irrigation canal requires a great deal of labor and expense, and there is a technology that can prevent sediment, stones, etc. from flowing into the irrigation canal even during floods. It has been demanded.

  In order to solve the problem of earth and sand flowing into the waterway during floods as described above, when the water level rises due to flooding etc., the water intake is automatically closed with a shutter to prevent earth and sand from flowing into the waterway. Several technologies have been proposed. For example, there is a sediment inflow prevention device that automatically closes a water intake with a shutter using the flow of water at the time of water increase (see, for example, Patent Document 1). This device includes a plate that detects water that has increased in water at one end, and a shaft that is attached to a wheel that engages with a shutter at the other end. Normally, at the water level, the wheel and shutter are engaged and the shutter is lifted. When the plate is pushed with water at the time of water increase, the shaft rotates, the wheel and the shutter are disengaged, the shutter falls by its own weight, and the water intake is closed.

  There is also a water stop gate that automatically closes the water intake with a door using the water level (see, for example, Patent Document 2). This water stop gate has a rotating shaft that traverses the water channel, and an arm that uses this rotating shaft as a fulcrum is attached to this rotating shaft. When the water level reaches or exceeds the specified water level, the door body is rotated by water pressure to close the intake port, and when the water level drops to the predetermined water level, the door body rotates upward due to the weight of the counterweight and opens the intake port. It is a device that opens and closes the intake port.

Japanese Patent Publication No. 7-30543 JP 2007-314964 A

  The devices described in Patent Document 1 and Patent Document 2 can prevent inflow of earth and sand, stones, and the like into the water channel because the water intake is completely closed by a shutter or a door when the water increases due to flooding or the like. At the same time, water intake stops. Some irrigation canals are required to continue water intake even during floods, but so far they have prevented sediment and stones from flowing into the canal during floods and floods. In addition, a device that can continuously perform water intake has not been developed.

  An object of the present invention is to provide a water channel sediment inflow prevention device capable of continuously taking in water while automatically closing the water intake when water increases and preventing inflow of sediment and stones into the water channel. is there.

  The present invention comprises a plate-like gate having a size capable of completely closing a water intake port, a pair of rotatable left and right connecting rods connecting the side surface of the gate and the upper portion of the water channel, and an upper end thereof. A pair of left and right repositioning rods that are pivotally connected to the front side surface of the gate, have a lower end placed on the upper surface of the water channel, and cooperate with the connection rod to support the gate above the water channel, and the pair of left and right reversal It has a collision plate that is installed so as to be bridged to the lower part of the rod and collides with water when the water increases. The gate has a water intake closed, while preventing the inflow of earth and sand into the water channel. A through-hole capable of taking water is provided, and when the water is increased, the collision plate is pushed by a water flow so that the lower end of the support rod is removed from the water channel, and the support rod and the connecting rod are supported above the water channel. That the gate falls and blocks the water intake. A waterway sediment inflow prevention apparatus according to symptoms.

  Further, in the present invention, the collision plate is formed of a net-like member or a member having a plurality of slits so that the support rod does not fall when the collision plate receives wind. It is characterized by that.

  Moreover, the present invention is characterized in that in the water channel sediment inflow prevention device, the through hole is provided in a central portion of the gate.

  Further, in the water channel sediment inflow prevention device according to the present invention, a screen for preventing the inflow of dust is installed at a water intake of the water channel, and when the water increases, the gate falls over the screen so as to cover the screen. It is characterized by.

  Further, the present invention is characterized in that, in the waterway sediment inflow prevention device, the gate can fall on a lid that covers a waterway downstream from the water intake.

  The water channel sediment inflow prevention device of the present invention uses the water flow to overturn the gate supported above the water channel and block the intake when the water increases, so that the water intake is automatically closed when the water increases such as during a flood. It is possible to prevent sediment, stones and the like from flowing into the water channel. At this time, the gate is provided with a through-hole capable of taking water, so that water intake can be continued even if the water intake is completely blocked by the gate, and it is suitable for irrigation waterways that need to continue water supply. Can be used.

  Further, according to the present invention, since the collision plate is formed of a mesh member or a member having a plurality of slits, the wind does not blow and the holding rod and the gate do not fall down and block the water intake. For this reason, it can be widely used for many water intakes.

  Further, according to the present invention, since the through hole of the gate is provided in the central portion of the gate, earth and sand and stone that settle in front of the gate cannot flow into the water channel. On the other hand, at the time of water increase, since the water level rises above the water channel, a relatively large head difference can be obtained. For this reason, even if it is a small through-hole, water intake can be continued. Thus, by making the position of the through-hole provided in a gate into a center part, inflow of earth and sand and a stone into a water channel can be prevented more reliably, and water intake can be continued.

  Further, according to the present invention, when a screen for preventing the inflow of dust is installed at the intake of the water channel, the gate falls over the screen so as to cover the screen. Can be used.

  According to the present invention, since the gate can be laid down on a lid that covers a water channel downstream from the water intake, if it is predicted that no flooding will occur in winter, the gate is previously taken into the water intake. By tilting to the opposite side, it is possible to prevent accidentally closing the water intake when it is not at the time of water increase.

1 is a perspective view showing a schematic configuration of a waterway sediment inflow prevention device 1 as one embodiment of the present invention. It is a perspective view which shows the state which the waterway sediment inflow prevention apparatus 1 of FIG. 1 covered the water intake. It is a schematic diagram for demonstrating a motion of the waterway sediment inflow prevention apparatus 1 of FIG. It is a block diagram of the latching tool 60 which prevents the lifting of the water channel sediment inflow prevention apparatus 1 of FIG. It is a fragmentary sectional view which shows the modification of the gate of the waterway sediment inflow prevention apparatus 1 of FIG.

  FIG. 1 is a perspective view showing a schematic configuration of a channel sediment inflow preventing apparatus 1 as an embodiment of the present invention, and FIG. 2 is a perspective view showing a state in which the channel sediment inflow preventing apparatus 1 covers a water intake. FIG. FIG. 3 is a schematic diagram for explaining the movement of the waterway sediment inflow prevention device 1. Hereinafter, the configuration and operation of the waterway sediment inflow prevention device 1 will be described by taking as an example the case of being attached to the water intake 101 of the irrigation channel 100.

  The waterway sediment inflow prevention device 1 is installed at the water intake 101 of the water canal 100, and automatically closes the water intake 101 when there is an increase in water, such as during a flood, and prevents sediment, stones, etc. from flowing into the water canal 100 and water. Is a device for continuously supplying water to the water channel 100. The gate 10 falls down when the water increases and closes the water intake 101 of the water channel, the replacement rods 21 and 31 and the connecting rod 41 supporting the gate 10, and receives the water flow when the water increases. Is provided with a collision plate 51 for overturning the holding rod 21 for supporting the above.

  The irrigation channel 100 is a concrete channel having a U-shaped cross section, and a screen 120 for preventing dust from flowing into the irrigation channel 100 is installed at the intake 101. In the irrigation channel 100, both side surfaces 102 and the bottom surface 103 are covered with concrete, and the top surface is covered with a metal lid 104 except for the water intake 101. The screen 120 includes a plurality of screen bars 121 and a support bar 122 that supports the screen bar 121. The support bar 122 is fixed to the side wall upper surface 105 of the water channel 100, and the screen bar 121 is located above the water flow. Is attached to the water intake 101 in a state inclined to the downstream side.

  The gate 10 is a rectangular plate-shaped body that covers and covers the screen 120 installed at an inclination to the water intake 101, and has a lateral width that is substantially the same as the width of the water channel 100. The length is slightly longer than the screen bar 121 of the screen 120. The gate 10 is provided with a plurality of through holes 11 in the center.

  The through-hole 11 does not completely shut off the water even when the gate 10 falls when the water increases, covers the screen 120, and closes the water intake port 101, but continues to supply water into the water channel 100. The water is sized so that water can pass but earth and sand and stone cannot pass. Here, the size that earth and sand and stone cannot pass is not the size that can completely block even very small earth and sand. There are various sizes of earth, sand, stones, etc. that are pushed together with water at the water intake 101 when the water increases, so that the diameter of the through hole 11 is very small in order to completely block even very small earth and sand. It is necessary to make it smaller. Although the very small through-hole 11 is preferable at the point which prevents earth and sand and a stone from flowing in into the water channel 100, on the other hand, a water intake amount falls extremely. Therefore, it is preferable to determine the size of the through-hole 11 in consideration of the size and amount of earth and sand, stones, and the like that are pushed together with water to the water intake 101 when the water increases.

  The through holes 11 are provided in a plurality of rows in the central portion 13 of the gate 10 and are not provided in the portions that become the lower portion 14 and the upper portion 15 at the time of falling. Sediment, stones, and the like that are pushed together with water to the water intake 101 at the time of water increase are dammed by the gate 10, so that the momentum decreases and settles in front of the gate 10. Providing the through hole 11 in the lower part 14 of the gate 10 is not preferable because sedimented sediment, stones, etc. may be accompanied by water and pass through the through hole 11. If the through-hole 11 is provided in the center part 13 of the gate 10, only water can be taken in without accompanying settled earth and sand, stones, etc. Further, when the water volume increases, the water level exceeds the upper end 16 of the overturned gate 10. The water flowing into the irrigation channel 100 through the through-hole 11 uses the height from the through-hole 11 to the water surface 80 as a driving force, so that the through-hole 11 is provided in the central portion rather than the upper portion 15 in order to increase the amount of water intake. Is preferred. The sizes (diameters) of the through holes 11 may all be the same, but large sands and stones are difficult to go upward, so the upper through holes 11 may be made relatively large.

  The gate 10 may be made of any material as long as it has a strength that does not cause deformation even when subjected to water pressure, and collides with earth and sand and stones, and is inexpensive and easy to process. It can be easily manufactured by using a steel plate or a fiber reinforced plastic material and providing the through hole 11 in the steel plate or fiber reinforced plastic material. Further, a metal net, a punched metal net, or a punching metal may be used to reinforce as necessary, and steel plates may be attached to the upper and lower sides.

  Further, a weight 55 is attached to the distal end portion 19 of the gate 10. The weight 55 is a member for setting the center of gravity of the gate 10 to the front side of the connecting rod 41 so that the gate 10 surely falls with the tip end 19 down when the support rod 21 falls. Therefore, even if the weight 55 is not provided, it is not always necessary to attach the weight 55 if the center of gravity of the gate 10 is in front of the connecting rod 41.

  The support rods 21 and 31 support the gate 10 horizontally above the irrigation channel 100 and also have a function of falling when the water increases and causing the gate 10 to fall on the screen 120. A total of four support rods 21 are attached to each front side surface 17 of the gate 10 and one to each rear side surface 18 of the gate 10. The front side of the gate 10 is a portion that becomes lower when the gate 10 falls.

  The refill rod 21 has the same shape and structure on the left and right sides, and ring-shaped members 23 and 24 are attached to both ends of the rod body 22, and the ring-shaped member 23 at one end is connected to the front side of the gate 10 via a connecting pin 25. The side surface 17 is rotatably connected. On the other hand, the ring-shaped member 24 at the other end enters an arcuate recess 90 provided on the side wall upper surface 105 of the water channel 100. Since the arc-shaped concave portion 90 is shallow and has an arc shape having a slightly larger diameter than the ring-shaped member 24, the ring-shaped member 24 is rotatable within the concave portion 90 and can easily come out of the concave portion 90. It is.

  The refilling rod 21 supports the gate 10 in an inclined state. As shown in FIG. 3A, in the normal state, the support rod 21 is positioned so that the ring-shaped member 24 entering the recess 90 is located on the downstream side with respect to the ring-shaped member 23 rotatably connected to the gate 10. ing. Since the support rod 21 is inclined, the ring-shaped member 24 is easily detached from the recess 90 in the downstream direction, but is difficult to remove in the opposite direction. In other words, the refill rod 21 is easy to turn counterclockwise around the connecting pin 25 but is difficult to turn in the opposite direction. When the collision plate 51 is pushed by water during a flood, The shaped member 24 can be removed from the concave portion 90 relatively easily, and can rotate counterclockwise around the connecting pin 25 to turn over the supporting gate 10.

  The angle of the support rod 21 when supporting the gate 10 can be considered as follows. Since the support rod 21 receives the weight of the gate 10, when the support rod 21 is arranged vertically, if the weight of the gate 10 is heavy, even if the collision plate 51 is pushed by water during a flood, the ring-shaped member 24 is recessed. There is a possibility that it will not deviate from 90. On the other hand, if the inclination is tight, the ring-shaped member 24 is easily detached from the recess 90 when the collision plate 51 is pushed by water during a flood, but there is a possibility that it may come off even with slight vibration. Considering this, the inclination angle may be determined in consideration of the weight of the gate 10 and the size of the recess 90. Therefore, when the weight of the gate 10 applied to the refill bar 21 is small, the refill bar 21 may be arranged vertically. Further, if the replacement rod 21 can stably support the gate 10, the recess 90 is not necessarily provided. This also applies to the concave portion 91 described later.

  The support rod 31 also has the same shape and structure on the left and right sides, and ring-shaped members 33 and 34 are attached to both ends of the rod body 32, and the ring-shaped member 33 at one end is connected to the rear side of the gate 10 via the connecting pin 35. The side surface 18 is rotatably connected. On the other hand, the ring-shaped member 34 at the other end enters an arcuate recess 91 provided on the side wall upper surface 105 of the water channel 100. Since the arc-shaped concave portion 91 has a shallow depth and an arc shape having a slightly larger diameter than the ring-shaped member 34, the ring-shaped member 34 is rotatable within the concave portion 91 and can easily come out of the concave portion 91. It is.

  As shown in FIG. 3A, the refill rod 31 supports the gate 10 while standing upright. Unlike the support rod 21, the support rod 31 is not covered with the collision plate 51. When the ring-shaped member 24 of the support rod 21 is removed from the recess 90, the gate 10 naturally falls down with the front side down. It is not necessary that the refill rod 31 is inclined like the refill rod 21.

  The connecting rod 41 has a role of supporting the gate 10 above the irrigation channel 100 in the same manner as the switching rods 21 and 31, and also keeping the gate 10 connected to the irrigation channel 100 so that the gate 10 does not escape. The connecting rod 41 has the same shape and structure as the left and right sticks 21 and 31, and ring-shaped members 43 and 44 are attached to both ends of the rod body 42. The ring-shaped member 43 at one end is rotatably connected to the side surface central portion 12 of the gate 10 via a connecting pin 45. On the other hand, the ring-shaped member 44 at the other end is rotatably connected to the support rod 122 of the screen 120. Thereby, the gate 10 can rotate clockwise and counterclockwise integrally with the connecting rod 41 with the connecting rod 41 as a radius around the support rod 122.

  In this embodiment, since the screen 120 is installed in the water intake 101 and the support rod 122 is attached to the upper surface 105 on both side walls so as to straddle the water channel 100, the ring-shaped member of the connecting rod 41 is connected to the support rod 122. 44 is inserted, but the attachment procedure of the ring-shaped member 44 is not limited to this. The connecting rod 41 is only required to be able to pivotably hold the gate 10 with respect to the irrigation channel 100, and the ring-shaped member 44 is fixed to the upper end portion of the side wall of the irrigation channel 100 via a coupling pin. May be.

  The movable range of the gate 10 is determined by the length of the connecting rod 41 and its mounting position. For this reason, it is necessary to determine the length of the connecting rod 41 and the fixing positions of the ring-shaped members 43 and 44 so as to cover the screen 120 installed in the water intake 101 and close the water intake 101 when the gate 10 falls. .

  The collision plate 51 is a member that is installed to remove the lower end of the holding rod 21 from the recess 90 and to cause the holding rod 21 to fall by being pushed downstream by receiving a water flow when the water volume increases, and a pair of left and right holding rods 21. The left and right replacement rods 21 are attached to the lower portion of the rod body 22. In the present embodiment, the collision plate 51 is a wire mesh. The collision plate 51 only needs to have a function of removing the lower end of the connecting rod 21 to be connected from the recessed portion 90 and tumbling the replacement rod 21 when receiving a water flow when the water is increased, so that a plate is used instead of the wire mesh. Is also possible. However, in the case of a plate, unlike the net, the area receiving force is large, so it may be pushed downstream by strong winds. There are similar concerns for nets with extremely small openings. On the other hand, in the case of nets with extremely large mesh openings, even when subjected to water flow, there is little resistance and it may not be pushed downstream. A mesh with a mesh size that is surely pushed downstream is preferable. Moreover, it may replace with a metal mesh and may provide a some slit in a board, and may have the same effect as a mesh.

  Since the size of the collision plate 51 is also directly connected to the area that receives the water flow, the width (height) should not be extremely narrow. Increasing the width increases the area that receives the water flow, and when it receives the water flow, it tends to be pushed downstream, but it is uneconomical even if it is extremely wide, and it may be pushed downstream by strong winds. Should not be as wide as necessary.

Operation | movement of the waterway sediment inflow prevention apparatus 1 is demonstrated.
The water channel sediment inflow prevention device 1 is installed at the water intake 101 of the irrigation channel 100, and the gate 10 is normally horizontally placed above the irrigation channel 100 by the support rods 21, 31 and the connecting rod 41, as shown in FIG. Has been lifted. Since the normal water level of the irrigation channel 100 is not more than the upper end 106 of the irrigation channel 100, the gate 10 remains held above the irrigation channel 100 unless the water level exceeds the upper end 106 of the irrigation channel 100 such as during a flood.

  When flooding occurs and water that exceeds the upper end 106 of the irrigation channel 100 rushes, the collision plate 51 is pushed downstream by the water. As a result, the lower end of the support bar 21 connected to the collision plate 51 is detached from the upper surface 105 of the side wall of the irrigation channel, and the front side of the gate 10 supported above the irrigation channel 100 by the changer bars 21 and 31 and the connection bar 41 is lowered. Since the support rods 21 and 31 are not connected to the side wall upper surface 105 of the irrigation channel, and the gate 10 is connected to the irrigation channel 100 via the connection rod 41, the front side is lowered as shown in FIG. In this state, it falls on the screen 120 and closes the water intake 101. At this time, the collision plate 51 is located between the gate 10 and the screen 120. For this reason, the collision board 51 does not collide with earth and sand, stones, etc., and is not damaged.

  The gate 10 is provided with a large number of through-holes 11 having a size that allows water to pass through but does not allow sediment and stone to pass through. Water flow to the downstream side can be continued while preventing inflow of earth and sand, stones, driftwood, etc. Since the gate 10 is connected to the irrigation channel 100 via the connecting rod 41, the gate 10 can be maintained as it is without being swept away by water even after falling over the screen 120.

  When there is no fear of flooding or water increase such as in winter, the gate 10 is placed on the irrigation channel 100 opposite to the intake port 101 of the irrigation channel 100 as shown in FIG. Since the water channel 100 is provided with a lid 104 that closes the water channel, the water channel 100 is left on the lid 104. Thereby, it is possible to prevent the refill rod 21 from falling down and the gate 10 from blocking the water intake 101 due to an earthquake or the like. Further, it is possible to prevent deformation and breakage of the waterway sediment inflow prevention device 1 due to snow weight due to snow accumulation. The replacement rods 21, 31 and the connecting rod 41 are pivotally connected to the gate 10, and the connecting rod 41 is pivotally connected to the support rod 122 of the screen 120, so there is no risk of losing parts and immediately. The state shown in FIG. 3C can be changed to the state shown in FIG.

  As shown in the above embodiment, the channel sediment inflow prevention device 1 according to the present invention falls down by using the momentum of the increased water when flooding or the like, while preventing the inflow of sediment, stones, driftwood, etc. Since the water intake 101 of the irrigation channel is closed by the gate 10 capable of continuing the intake, it can be suitably used for an irrigation channel that needs to continue water supply downstream even during a flood. Since the conventional earth and sand inflow prevention device completely closes the water intake 101 with a shutter and a door, water intake is completely stopped if the shutter and the door are accidentally lowered at a normal water level. On the other hand, in the channel sediment inflow prevention device 1 shown in the present embodiment, since the gate 10 is provided with the through-hole 11 through which water passes, the gate 10 falls down due to an earthquake or the like and blocks the water intake 101. However, water intake can be continued.

  Moreover, in the said embodiment, although the screen 120 which prevents inflow of a dust was provided in the water intake 101 of the water channel, and the gate 10 showed this screen 120, the water channel sediment inflow prevention apparatus which concerns on this invention is a screen. It goes without saying that it can be installed and used in the water intake 101 where 120 is not provided. In the case of the water intake 101 where the screen 120 is not provided, this can be easily realized by providing a stopper for receiving the fallen gate 10 on the wall surface of the water channel 100. Furthermore, when the width of the gate 10 is made wider than the width of the water channel 100 and the gate 10 falls down, the front water channel wall of the water channel 100 may be used as a stopper.

  Moreover, the water channel sediment inflow prevention apparatus which concerns on this invention can be deform | transformed and used in the range which does not change a summary. Even after the gate 10 falls, the gate 10 is fixed to the irrigation channel 100 via the connecting rod 41, and the screen 120 functions as a stopper, so that the gate 10 does not basically move. However, when the water flow is intense and the gate 10 may be lifted, a locking tool as shown in FIG. 4 may be provided. The locking tool 60 includes an L-shaped locking body 61 attached to the front end portion of the gate 10 and an L-shaped locking body 62 attached to the front surface of the bottom wall of the water channel 100. The two locking bodies 61 and 62 are hooked to prevent the gate 10 from being lifted. When the gate 10 is rotated counterclockwise, the catches of the two locking bodies 61 and 62 can be released, so that the gate can be brought into the state shown in FIG. .

  In the above embodiment, the example in which the through hole 11 is provided in the gate 10 has been described. However, instead of the through hole 11, a lateral slit may be provided in the gate 70 as shown in FIG. There are various methods for providing a lateral slit in the gate 10, and for example, it can be realized by arranging the bars 71 side by side at intervals. When such a gate 70 is put on the screen 120 attached to the water outlet 101, the screen bar 121 of the screen 120 and the bar 71 of the gate 70 overlap each other, so that the opening becomes a lattice shape. The space between the screen bars 121 of the screen 120 is narrow, and it can be suitably used when a relatively large dust such as a stone or driftwood is targeted. Such a gate 70 is easy to manufacture and the gate 70 can be easily cleaned. Here, the interval between the bars 71 is wider toward the top.

  In the above embodiment, the gate 10 is supported above the irrigation channel 100 by the replacement rods 21, 31 and the connecting rod 41. However, the gate 10 is stabilized above the irrigation channel 100 by the replacement rod 21 and the connection rod 41. The support rod 31 may be omitted if it can be supported in a general manner. For example, when one end of the connecting rod 41 is connected to the rear side surface 18 of the gate 10, the replacement rod 31 can be omitted.

DESCRIPTION OF SYMBOLS 1 Waterway sediment inflow prevention apparatus 10 Gate 11 Through-hole 12 Gate side surface center part 13 Gate center part 17 Gate front side surface 21 Replacement rod 41 Connecting rod 51 Collision plate 100 Water channel 101 Water intake 104 Lid 105 Water channel upper surface 120 Screen

Claims (5)

A plate-like gate with a size that can completely block the water intake of the waterway;
A pair of rotatable left and right connecting rods connecting the side surface of the gate and the upper part of the water channel;
A pair of left and right support rods, the upper end of which is pivotally connected to the front side surface of the gate, the lower end is placed on the upper surface of the water channel, and the gate is supported above the water channel in cooperation with the connection rod;
It is attached so as to span the lower part of the pair of left and right side sticks, and has a collision plate with which water collides when the water increases.
The gate is provided with a through hole capable of taking water while blocking the inflow of earth and sand and stones into the water channel with the water intake closed.
At the time of water increase, the collision plate is pushed by the water flow, so that the lower end of the replacement rod is removed from the water channel, and the gate supported above the water channel by the replacement rod and the connecting rod falls down to block the intake port. A waterway sediment inflow prevention device.   The waterway sediment according to claim 1, wherein the collision plate is formed of a net-like member or a member having a plurality of slits so that the support rod does not fall when the collision plate receives wind. Inflow prevention device.   The water channel sediment inflow prevention device according to claim 1, wherein the through hole is provided in a central portion of the gate.   4. The screen according to claim 1, wherein a screen for preventing inflow of dust is installed at a water intake of the water channel, and when the water is increased, the gate falls over the screen so as to cover the screen. The water channel sediment inflow prevention device described in 1.   5. The water channel sediment inflow prevention device according to claim 1, wherein the gate can fall on a lid that covers a water channel downstream of the water intake.

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